Default [Q] Changing build.prop on Moto X Verizon Non-Dev Edition

I have root my device using SlapMoto. Since my Moto X Verizon is carrier locked and even when it says that it is unlock for international carrier I am unable to use it in India on any carrier.
So I decided to give
a try and see if I can carrier unlock it.

But build.prop reverts everytime I make a change. I have tried using build.prop editor and
also tried
mounting /system in rw mode and then pushing file with adb. Both of the methods didn't work.

I cannot use the method mentioned in the thread since I am in stock recovery and it cannot verify the signature.
Anybody has any cool ideas on how can I change the build.prop.